Question

Пожалуйста Братцы решите первое​

Answer 1

$- (x {}^{ - 6} ) {}^{ - 2} \div x {}^{14}$

$- (x {}^{12} ) \div x {}^{14}$

$- \frac{x {}^{12} }{ {x}^{14} } = - \frac{1}{x {}^{2} }$

$- \frac{1}{2 {}^{2} } = - \frac{1}{4} = - 0.25$

Answer 2

$- ( {x}^{ - 6} ) { }^{ - 2} \div x {}^{14} = \\ = - x {}^{( - 6) \times ( - 2)} \div x {}^{14} = \\ = - \frac{ x {}^{12} }{ {x}^{14} } = \\ = - \frac{ 1}{ {x}^{2} } ; \\ x = 2; \\ - \frac{1}{2 {}^{2} } = - \frac{1}{4}$



$\sqrt{25} - \sqrt{2} \times \sqrt{8} = \\ = \sqrt{5 {}^{2} } - \sqrt{2} \times \sqrt{2 {}^{2} \times 2 } = \\ = 5 - \sqrt{16} = 5 - 4 = 1$